Deion wants to strengthen the topic sentence of his second paragraph (sentences

Deion wants to strengthen the topic sentence of his second paragraph (sentences 7-9) to better reflect its organizational structure. Which of the following best replaces sentence 7?
O A It is precisely because astronauts see Earth "hanging in space, that they are compelled to work toward ensuring
the survival of humans and the planet.
B. The view of Earth Changing" in space is so very different than the view that astronauts have when they are with
other humans on the planet.
O C. The problem with astronauts seeing Earth "hanging" in space, is that it compels them to work toward ensuring
the survival of humans and the planet,
O D. The first thing the astronauts do is see Earth Changing in space, and next they are compelled to work toward
ensuring the survival of humans and the planet.